2006 xterra 4.0 off road. sometimes starts and runs fine. other time it starts up and it barely idles then stalls. Sometimes i move the shifter to drive and back to park and it cranks right up and runs fine other times that doesnt work. ran diagnostic no codes but shows car is going 170mph when not even running.

SOURCE: 92 Maxima Putters and sometimes even no gas sometimes

Yes I can help you. Change your coolant temperature sensor and all will be well. Only use Nissan, Bosch, or NGK part.

SOURCE: Car is stalling while driving

Fuel filter?

SOURCE: 2006 Altima doesn't shift into reverse

The problem that I could see is the transmission/shift solenoid. The solenoid thing is located inside the transmission. The repair should run $200-$250 or there abouts. If you don't fix it quickly though, you will wreck the transmission and you don't want to know how much that costs!

You may also contact the manufacturer for second opinion.

Hope this helps and have a great evening!

SOURCE: my shifter is stuck in park

If the steering wheel is turned the continue to turn the steering wheel in the same direction as the tires are going while applying firm pressure to the brake the try to pull it out of park. I know this sounds crazy but they have so many safety swithches on them, you may have one not activating.

SOURCE: timing chain broke as i

Hopefully, you don't have severe engine damage. It has to be changed of course. It is a pretty hard job I am afraid. As far as how to do it, because of all the steps and timing procedures, it is best to buy a Haynes book for your car or let a professional do it. Any other questions, please contact me. I am here to help in anyway I can.